Rotary pressure or vacuum pump.



Gm l. LEUNARD.

ROTBY PRESSURE 0B, VACUUM PUMP.

MPLMLIUN FILED www5, 1911. MMWR M11. 2a, uns.

Fatemd, my 532i, MMS.

LMI

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'UETTED sTATEs PATENT oEEroE..

GEORGE'I. LEONARD, 0F LOS ANGELES, CALIFORNIA, ASSIGNOR, BY DIRECT AND y MESNE ASSIGNMENTS, TO LEONARD ROTARY PUMP CORPORATION, OF LOS AN- GELES, CALIFORNIA, A CORPORATION OF CALIFORNIA. y

ROTARY PRESSURE OR VACUUM PUMP.

specication of Letters raient.

Application led September 25, 1911, Serial No. 651,282. vRenewed April 2S, 1913. Serial No. 764,260.

To all whom it may concern Be it known that l, GEORGE lt. LEONARD, a citizen `of the United States, residing at Los Angeles, in the, county of Los Angeles and State of California, have invented a new and useful Rotary fressure or Vacuum Pump, of which the following is a specification.

rThis invention relates to rotary pressure or vacuum pumps and the object of the invention is to provide a rotary pressure o-rvacuum pump by means of which a far greater pressure or vacuum may be pro-- duced than heretofore by any known rotary pum A further object is to prevent internal leakage in the pump. y

A further object of the invention is to eliminate all valves and to attain efficiency of operation, simplicity and economy of construction and entire absence of reciprocating parts.

In carrying out my invention, l employ a pair of gears which mesh with each other and rotate in opposite directions, the gears being confined 1n a casing with an admission at one side and an exhaust at the other. ll submerge these parts in a liquid, the liquid having access directly to the discharge side of the gears, but being excluded from the inlet side. The ears lit with a working lit within the casing and the liquid acts as a seal to prevent any leakage past the gears and prevents the passage of any gas from the inlet to the discharge, other than that which is carriedpin the spaces between the teeth of the gears.

Referring to the drawings: Figure 1 is a vertical cross section through the device. Fig. 2 is a section on line :v2- m2 in Fig. 1.

lin its preferred form the invention consists of a casing 1 within which are two gears 2 meshing with each other, and mounted on shafts 3 and 4 which are journaled in the sides of the casing 1. The casing ,1 is cut away at one side to form a discharge opening 5 and an inlet port 6. op lposite from the discharge opening 5, communicates with an inlet pipe 7. The foregoing elements are submerged in liquid 8, for example, oil, which acts to seal the spaces between the gears themselves and between the gears and the casing, the liquid coming in direct contact with the gears Lof the receptacle 9 and the shaft 3 extends through a stuffing box 14 and may be driven in any desired manner.

ln operation, the gears are rotated in the direction of the arrow, which produces a suction through the pipe 7 'on account of the teeth of the gears removing all gas or liquid from within the space 6 and carrying it circumferentially around the outer peripheries of the gears, and discharging it into the opening 5 where the gas passes into the liquid 8 and rises therefrom into the spacell at the top, the gas being lighter than the liquid 8. As the gears rotate, their teeth will close together, entrapping a certain quantity of liquid, so that as the teeth Patented July 22, 1913.

of the gears close together in mesh, this liquid thus entrapped would have to be compressed. As the speed of the closing movement of the teeth is greater than the speed at which the oil can escape, and as the liquid is virtually incompressible, 1 provide an Vescape for this entrapped liquid by drilling holes 15 from points between alternate spaces between teeth, the two holes from each alternate pair of spaces being drilled at such an angle, as clearly shown in Fig. 1, that the holes are close together and establish communication from a space whenit is at a point of closest fit, with a point located directly in the body of liquid 8, so that the entrappcd liquid is expelled through these holes 15 and returned to the main body of liquid 8. The comparatively slight-amount of liquid which is carried through into the space 6 is immediately exhausted therefrom by the outwardly moving teeth of the gears and is carried around by the gears and returned into the main body of liquid 8, where the gas bubbles up through the liquid into the space 11.

When the machine is being used as a 6 is immediately expelled therefrom.

A In operating the machine as a vacuum pump, the pressure within the space 1l should not be greater than atmospheric pressure, the storage chamber 11 not being re- 15 `quired for operating the machine as a vacuum pump.

What I claim is: l. A rotary pressure or vacuum pump, comprising a casing, a pair of gears meshing witheach other in said casing, an inlet pipe communicating with the interior of the casing at one side of the gears, the other side of the casing having a discharge opening, and liquid in said discharge opening sealing all spaces, and means permitting liquid to escape from a space between teeth to a relativelyl unlimitedspace. f

2. A rotary pressure or vacuum pump, comprising a casing, a pair' of gears meshing with each other in said casing, an inlet pipe communicating with the interior of the casing at one side of the gears, the other side of. the casing having a discharge opening, and liquid in said discharge opening sealing all spaces, the gears having passages leading from spaces between teeth to other points of the gears close to said spaces whereby liquid can escape from between teeth which are in mesh to a relatively unlimited space.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 18th day of September, 1911.

G. T. HACKLEY,

GLADYS RUSSELL. 

